Practice questions
THIS WEEK, we will look at multiple-choice questions from two of the topics covered by the syllabus that we have studied this year.
Read the stem of the questions carefully. Try to answer the questions first and then compare your answers with the ones you will be given next week. Do not be tempted to guess the answer; read, think carefully, and then choose the best answer for the question. Sometimes it requires very careful thought to eliminate the detractor; do not allow it to mislead you. If you bear these tips in mind and you have studied well, then you should be that able to answer all of them correctly!
1. What is an example of a reflex arc? A. Retina –– motor neuron –– relay neuron –– sensory neuron –– iris muscle. B. Retina –– motor neuron –– sensory neuron –– relay neuron –– iris muscle. C. Retina –– sensory neuron –– motor neuron –– relay neuron –– iris muscle. D. Retina –– sensory neuron ––relay neuron –– motor neuron –– iris muscle.
2. A motor neuron transmits impulses from A. Receptor to muscle; B. Muscle to spinal cord; C. Receptor to spinal cord; D. Spinal cord to muscle.
3. What are the characteristics of all neurons?
Questions 4 to 6 refer to the diagram below showing a vertical section through the human brain.
4. Which structure controls balance and muscular coordination? A. 1 B. 2 C. 3 D. 4 5. What are some of the functions of parts labelled 1, 3 and 4? 6. What are the numbered parts?
7. What would damage to No. 2 result in? A. Difficulty in breathing. B. Inability to control body temperature. C. Raised insulin levels. D. May cause rickets.
8. Which area of the central nervous system controls the body’s water balance? A. Cerebellu;m B. Cerebrum; C. Hypothalamus; D. Medulla.
9. A relay neuron transmits impulses from A. Muscle to spinal cord; B. Receptor to spinal cord; C. Sensory neuron to memory neuron; D. Receptor to muscle.
10.Which of the given options describes the connections of the neurons in a reflex action correctly? 11. A sensory neurone transmits impulses from A. Muscle to spinal cord; B. Receptor to muscle; C. Spinal cord to muscle; D. Receptor to spinal cord.
12.Three directions in which nerve impulses can travel in the nervous system are given below 1. Away from the central nervous system; 2. Towards the central nervous system; 3. Within the central nervous system.
How do the impulses in sensory and relay neurones travel?
13. What does the hypothalamus control? A. Adrenaline secretion; B. Body temperature; C. Heartbeat; D. Memory.
14. Which statement best describes the movement of water through the stem of a plant? A. Water moves up the stem as it evaporates from the leaves. B. Water moves up the stem as it is pushed by water entering the roots. C. Water moves up the stem because it is used in photosynthesis. D. Water moves up the stem by osmosis.
15. What is the main cause of water moving up to the leaves in leaves? A. Evaporation from the epidermis of the leaf; B. Evaporation from the walls of the cells of the mesophyll; C. Use of water in photosynthesis.
16. Under which set of conditions will the transpiration rate of a well-watered plant be fastest? A. A cool, dry, windless day; B. A cool, rainy, windy day; C. A hot, dry, windy day; D. A hot, rainy, windy day.
17. Which effects will an increase in temperature and an increase in humidity have on the transpiration rate of a plant? 18. What contributes to the wilting of plants? A. The mesophyll cells lose turgor. B. The phloem stops translocating. C. The stomata close. D. The xylem fills with air.
19. Through which organs do carbon dioxide molecules, magnesium ions and nitrate ions enter plants?
20. Which substances are transported in the xylem and in the phloem?
21. The diagram shows part of a flowering plant. Where does the most transpiration take place?
22. When a complete ring of bark is removed from the trunk of a tree, it will eventually die because this action cuts off the supply of A. Mineral salts to the leaves; B. Nutrients to the roots; C. Oxygen to the roots; D. Water to the leaves.
End of test. Have a great week!